Finding the Fourth Proportional to 72,458.18, 99,876.74 and 57,119.72

Step by Step Solution

1. Step 1: Write the proportion equation
   72,458.18 : 99,876.74 = 57,119.72 : x
2. Step 2: Convert to fraction form
   72,458.18/99,876.74 = 57,119.72/x
3. Step 3: Cross multiply
   72,458.18x = 99,876.74 × 57,119.72
4. Step 4: Simplify right side
   72,458.18x = 5,704,931,423.31
5. Step 5: Solve for x
   x = 5,704,931,423.31/72,458.18
6. Step 6: Final answer
   x = 78,734.13